We're nearly done with it, OP.

It began immediately after WW2-we could go back further, but for the "Century" bit the 1950s makes the most sense.
>Partition of India
>Palestine War
>Egyptian Revolution
>Suez
>Aden Emergency
>Cod Wars
>Troubles
>Hong Kong handover
>Afghanistan War
>Brexit shitshow
>Overplayed pro-Israel Hand

First, Britain lost of all of its territories (and influence) overseas. Then, it lost all of its prestige at home. We have long been the "haha, cucks" nation of Europe, but we are absolutely in the thick of our humiliation and decline. Our nation is seen by our peers as a joke, by our enemies as a fallen adversary to be pitied (or manipulated), by our lessers as a means of them getting ahead. Right now, we are;
>governed by the least representative government in the history of british democracy
>seeing wide ranging, completely unregulated surveillance on a scale never seen before
>in the AFTERMATH of demographic change (it can no longer be reversed), with Britain shifting under its own weight to re-define what the country even is
>the total remaking of our foundation origins (goodbye alfred the great, goodbye the normans, goodbye the vikings, goodbye england-hello the "WW2 good guys" cosmopolitan sludge with a cockney accent
>rife with politicla instability

It should wrap up in the 2050s, assumedly with the end of the British Monarchy and the creation of the Republic of Britain. The last Windsor monarch will be a politician for one of the many "monarchist" lobbies in Europe, like with France.

>>721151551
No he wasn't, you brainlet. Britain were preparing for the end of Empire before WW2, before WW1 even. We are IN the "good ending" of the Empire where we retain economic+cultural ties to all our settler colonies and cut ties with the resource extraction shitholes in Africa and Asia once they stopped being profitable.

Every other timeline sees Britain get cucked in a thousand Ireland-equivilant wars forever, all of which we lose in the end.
>>721151680
Most seem to assume it'll eventually be reformed or altered to be a non-starter that's only really used in schools and businesses, akin to parental controls with extra steps.

People forget that British elections are "winner takes all", while Labour won a "landslide" they are in fact the least representative government in the history of British elections. They will lose at the next election and most of this faggotry will be repealed or reformed to oblivion.